One of the big questions that lingers, however, is just how big an impact will RTB have on the online advertising ecosystem outside of display. Take video, for instance. Skeptics make interesting points about RTB's potential shortcomings in the video space and suggest that RTB may not be as applicable to video.

Are the skeptics right? That remains to be seen, but in the meantime, RTB continues to make inroads in video. The latest example of that: yesterday VEVO announced the launch of an RTB platform that it will use to move unsold pre-roll ad inventory.